1. AdBlock Plus

Annoyed by adverts? Troubled by tracking? Bothered by banners? Install Adblock Plus now to regain control of the internet and change the way that you view the web.

A short video overview is available at http://www.youtube.com/watch?v=oNvb2SjVjjI

2. Aardvark

Cool utility for cleaning up a page (for printing or better viewing) as well as for web development. Displays a red rectangle on the element under the mouse — hit “w” to go wider (get the containing element), then hit other keystrokes to remove, etc.

3. Autofill Forms

Autofill Forms enables you to fill out web forms with one click or a keyboard shortcut.

4. Colorful Tabs

The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface. For Seamonkey & Flock. An essential.

5. Codetech

Get the feel of Dreamweaver in a Firefox extension. Edit your documents right next to your web pages as you surf.

6. Colorzilla

Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies…

7. Clippings

Save frequently-entered text for pasting later.

8. CodeBurner

CodeBurner is a Firefox add-on that integrates with Firebug, to extend it with reference material for HTML and CSS.

9.  Console2

Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.

10. CSS Validator

Validates a page using the W3C CSS Validator.

11. CSS Viewer

A simple CSS property…

12.  CS Lite

This extension will allow you to easily control cookie permissions. It can be accessed from the statusbar, a toolbar button, or the context menu. Just click on the icon to allow, block, or temporarily allow the site to set cookies. You can also view, clear or edit the cookies and exceptions by right clicking on the cs lite icon. For safer browsing you may choose to deny cookies globally and then enable them on a per site basis. You can also download a blocklist that contains a list of untrusted hosts that you may choose to import into FF and block. The blocklist can be configured to automatically update or can be updated manually.

This is a lighter, scaled down version of CookieSafe. It contains less features, but is considerably easier to use. The extension has been completely recoded from top to bottom making this the most stable version to date.

13.  Download Statusbar

View and manage downloads from a tidy statusbar – without the download window getting in the way of your web browsing.

14. Dummy Lipsum

Generate “Lorem Ipsum” dummy text (from http://www.lipsum.com).

15. DOM Inspector

DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.

16. Edit CSS

Stylesheet modifier in the Sidebar.

17.  FireShot

FireShot is a Firefox extension that creates screenshots of web pages (entirely or just visible part).

Unlike other extensions, this plugin provides a set of editing and annotation tools, which let users quickly modify web captures and insert text annotations and graphical annotations. Such functionality will be especially useful for web designers, testers and content reviewers.

The captures can be:

- uploaded to FREE public screenshot hosting
- saved to disk (PNG, GIF, JPEG, BMP)
- printed
- copied to clipboard
- e-mailed
- sent to configurable external editor for further processing.

18.  Firefox Accessibility

Support web developers and people with disabilities in accessing and testing web resources for accessibility features.

19. Favicon Picker

Tired of that boring default icon next to your bookmarks? This extension adds an interface allowing you to pick the icon for each of your bookmarks.

20.  FasterFox

Performance and network tweaks for Firefox…

21. Font Finder

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

22.  Firebug

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page…

Firebug 1.5 requires Firefox 3.5 or higher.

23.  FirePHP

FirePHP enables you to log to your Firebug Console using a simple PHP method call.

You need to have Firebug 1.5+ installed.

24.  FireFTP

FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.

25.  Greasemonkey

Allows you to customize the way a webpage displays using small bits of JavaScript. …

26.  GridFox

Draws a grid on top of a website

27.  HttpFox

An HTTP analyzer addon for Firefox.

28. Image Zoom

Adds zoom and rotation functionality for images…

29. IE NetRanderer

Adds buttons, tools menu and contextual menu entries to get a screenshot of the current page with IE NetRenderer.

Keyboard shortcuts are also available: Ctrl+Shift+F5/F6/F7/F8 to render the page in IE5.5/6/7/8 Beta 2 (Cmd+Shift+F* on Mac).

Really useful for webmasters which are not using Windows!

You can also access the IE NetRenderer service here: http://ipinfo.info/netrenderer/index.php

Please note that the extension developper is not affiliated with GEOTEK, providing the IE NetRenderer service. You can visit his website here: http://nicopensource.free.fr/

30.  IE Tab

IE Tab – an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox…

This is a great tool for web developers, since you can easily see how your web page displayed in IE with just one click and then switch back to Firefox.

31. IE View

Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.

32.  InspectorWidget

This extension will add a right-click menu item and a menu item to the tools menu that will allow you to add more search bars to the navigation toolbar. Effectively giving you the ability to have multiple search bars at once. …

This extension will add a right-click menu item and a menu item to the tools menu that will allow you to add more search bars to the navigation toolbar. Effectively giving you the ability to have multiple search bars at once.

To use:
select the Tools menu and click the “Add Searchbar” menu item (this can also be accessed by right click in the toolbar area).
If more than one search bar exists annother menu item will appear in the same location that allows you to remove any added search bar.

33. Java Console

The Java Console enables you to monitor status and debug running applets and Java Webstart application that use Sun Java technology.

NOTE: This add-on and its associated JRE is no longer supported by Sun.  Do not install this add-on.

34. Javascript Debugger

Venkman is the code name for Mozilla’s JavaScript Debugger. Venkman aims to provide a powerful JavaScript debugging environment for Mozilla based browsers.

35. JSView

All browsers include a “View Source” option, but none of them offer the ability to view the source code of external files. Most websites store their javascripts and style sheets in external files and then link to them within a web page’s…

36. Live HTTP Headers

View HTTP headers of a page and while browsing.

37.  LinkChecker

Check the validity of links on any webpage.

38.  Live HTTP Headers

View HTTP headers of a page and while browsing.

39. Minimize to Tray

Minimizes Mozilla windows into the system tray. Also includes a right clickable tray icon menu to further load only the windows you want visible.

40.  Measureit

60. Tab Scope

Shows a popup on tabs and enables you to preview and navigate tab contents through popup. Major features are:

* Real-time preview of tab contents
* Navigate (Back/Forward/Reload/Stop) through popup
* Scroll pages or frames in preview with mouse wheel
* Click links or buttons directly in preview

61. Tamper Data

Use tamperdata to view and modify HTTP/HTTPS headers and post parameters.

Trace and time http response/requests.

Security test web applications by modifying POST parameters.

FYI current version of Google Web Accelerator is incompatible with the tampering function of TamperData. Your browser will crash.

62. Unhide Passwords

If you aren’t concerned about someone looking over your shoulder and stealing your passwords, why hassle with those obfuscated password fields, where you never know whether you typed your 30 character code correctly or not…

This extension shows the contents of password fields in cleartext (instead of the asterisks), to make that process a bit easier.

Due to popular “demand” the double-click feature has been removed again from V1.2.1 on.

63. View Dependencies

View Dependencies adds a tab to the Page Info window, in which it lists all the files which were loaded to show the current page.

It orders the files by servers and by types (image, stylesheet, script, …). The size of each file, the total size per server and the total page size are displayed.

With a context menu, you can open any file in a new tab or new window. You can also copy an url to the clipboard.

64. View Source Chart

Inspect the DOM at lightning speed.
If you’re new to the containment concept, one glance at a Source Chart and you’re over the learning curve.

65. W3C Offline Page validator

68. Window Resizer

Resize your browser to various standard resolution sizes…

*UPDATE – JAN 28 2009: We will try to update this add-on for the latest Firefox version in the next coming week.

69. X-ray

See the tags on a page without viewing the sourcecode.

One installed the X-Ray command is available by right-clicking as well as in the Tools menu. When applied to a page it can help you see how the document was constructed without having to go back and forth between the sourcecode and the page in your browser. Is that list made of li, dd or p elements? Is that an h3 tag or just some bolded text? X-Ray shows you what’s beneath the surface of the page.

70. Yslow

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. YSlow is a Firefox add-on integrated with the Firebug web development tool. YSlow grades web page based on one of three predefined ruleset or a user-defined ruleset. It offers suggestions for improving the page’s performance, summarizes the page’s components, displays statistics about the page, and provides tools for performance analysis, including Smush.it™ and JSLint.

71 . Yellowpipe Lynx Viewer Tool

RightLynx displays a Lynx view of a web page via right-click or Tool menu.
With just one click and without leaving the page (RightLynx opens in a new, small window), preview the page you are on with a Lynx Viewer.
You can see what what a page will look like when viewed with Lynx, a text-mode web browser. It is also presumably, how search engines see your site. In addition, it can help determine if web pages are accessible to the vision impaired.

The New Adobe Flash Professional CS5 allows you to create iPhone and iPod applications using Actionscript 3. The Public beta of Adobe Flash Professional CS5 with support for creating application for iPhone and iPods is planned for later this year.

iPhone App Developers (A.K.A Devs) can write new code or reuse their existing web content to build applications for iPhone.  Adobe writes on their site that” Because the source code and assets are reusable across the Flash Platform runtimes,—Adobe AIR and Flash Player—it also gives developers a way to more easily target other mobile and desktop environments.”

More info about Adobe Flash Professional CS5 will be updated time to time. Be sure that you subscribe our rss feeds.